59 lines
2.2 KiB
C
59 lines
2.2 KiB
C
/*
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Copyright 2025 Kamil Kowalczyk
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Redistribution and use in source and binary forms, with or
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without modification, are permitted provided that the following
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conditions are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. Neither the name of the copyright holder nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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“AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <libk/types.h>
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#include <libk/bitmap.h>
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#include <libk/string.h>
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void bitmap_init(struct bitmap *bm, byte_t *baseptr, usize_t bit_count) {
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bm->baseptr = baseptr;
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bm->bit_count = bit_count;
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memset(bm->baseptr, 0, (bit_count + 7) / 8);
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}
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void bitmap_set(struct bitmap *bm, usize_t k) {
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byte_t *byte = (byte_t *)((uptr_t)bm->baseptr + (k / BM_BITS_PER_BYTE));
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*byte = (*byte | (1 << (k % BM_BITS_PER_BYTE)));
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}
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void bitmap_clear(struct bitmap *bm, usize_t k) {
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byte_t *byte = (byte_t *)((uptr_t)bm->baseptr + (k / BM_BITS_PER_BYTE));
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*byte = (*byte & ~(1 << (k % BM_BITS_PER_BYTE)));
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}
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bool_t bitmap_test(struct bitmap *bm, usize_t k) {
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if (k >= bm->bit_count)
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return 0;
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byte_t byte = *(byte_t *)((uptr_t)bm->baseptr + (k / BM_BITS_PER_BYTE));
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return byte & (1 << (k % BM_BITS_PER_BYTE));
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}
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